Run something later — practice exercise

What you'll be asked to do

1. 1.Run something laterexercise · easy · 10 min

   Use setTimeout to report done after a short delay.

   Passes when: #out should show done.

2. 2.Cancel a timerexercise · easy · 10 min · practice plan

   Schedule a timer, cancel it, and report cancelled instead.

   Passes when: #out should show cancelled.

3. 3.Pass an argumentexercise · easy · 10 min · practice plan

   Pass a name through setTimeout and greet it.

   Passes when: #out should show hello Ada.

4. 4.Chain two timersexercise · easy · 10 min · practice plan

   Schedule a second timer from inside the first and report both steps.

   Passes when: #out should show one two.

5. 5.Check the delay was respectedexercise · medium · 10 min · practice plan

   Report that at least ten milliseconds passed.

   Passes when: #out should show waited.

6. 6.Fix the handler called immediatelybug fix · easy · 8 min

   Brackets run the function now instead of scheduling it.

   Passes when: #out should show later.

7. 7.Fix the timer never cancelledbug fix · easy · 8 min · practice plan

   The id is not kept, so clearTimeout has nothing to cancel.

   Passes when: #out should show cancelled.

8. 8.Fix clearInterval used on a timeoutbug fix · easy · 8 min · practice plan

   A timeout is cancelled with clearTimeout.

   Passes when: #out should show stopped.

9. 9.Fix the argument never passedbug fix · easy · 8 min · practice plan

   Extra arguments go after the delay, not before it.

   Passes when: #out should show hello Grace.

10. 10.Fix the second timer scheduled too earlybug fix · easy · 8 min · practice plan

    Both timers were started at once, so the order is not guaranteed.

    Passes when: #out should show one two.

Between them these tasks cover setTimeout, clearTimeout and Timer arguments.

Looking for a different chapter? See every practice set, or switch to the interview theory questions.